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Every record for a domain, blocklists for an IP
Trust map
Every domain your email depends on
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Names registered to look like yours

Fix records

Write records
Tick who sends as you, get the records
Route to Refused
Safe, tested steps to refuse forged mail
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Read your mail

Trace an email
Paste headers to see a message's route
Read DMARC reports
Provider XML reports, made readable

Many domains

Check a fleet
Up to 25 domains in one table, worst first
Compare
Up to 4 domains side by side
Badges and API
README badge, JSON and a CI check

Find risks

DNS lookup
Every record for a domain, blocklists for an IP
Trust map
Every domain your email depends on
Find lookalikes
Names registered to look like yours

Fix records

Write records
Tick who sends as you, get the records
Route to Refused
Safe, tested steps to refuse forged mail
Try a change
Preview an edit before you publish
Check DNS changes
See who has your new record yet

Read your mail

Trace an email
Paste headers to see a message's route
Read DMARC reports
Provider XML reports, made readable

Many domains

Check a fleet
Up to 25 domains in one table, worst first
Compare
Up to 4 domains side by side
Badges and API
README badge, JSON and a CI check

Reading DNS…

Stamp

Lookups read public DNS. Answers are shared for up to five minutes. Nothing is saved.

No emails were forged in the making of this site.

Designed and built independently.

one.one.one.one DNS records | Stamp

Domain or IP addressDomain

one.one.one.one

3 of 9 record types published. Grade its email setup

A2 AAAA2 MX0 TXT1 NS0 CNAME0 SOA0 CAA0 DMARC0

A2

Website address, IPv4

1.1.1.1TTL 300
1.0.0.1TTL 300

AAAA2

Website address, IPv6

2606:4700:4700::1001TTL 300
2606:4700:4700::1111TTL 300

MX

Where its mail goes

None published

TXT1

Notes, SPF among them

_27pzqheibkz3ec5g8loj1d4eppt1o4d

NS

Who answers for its DNS

None published

CNAME

Alias for another name

None published

SOA

The zone's admin details

None published

CAA

Who may issue its certificates

None published

DMARC

What to do with forged mail

None published

Blocklists

Not listed on Spamhaus DBL.

Spamhaus DBL